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Operational mode transition in a rotating detonation engine

Journal of Zhejiang University-Science A(Applied Physics & engineering) 2020年第9期21卷 721-733页

作者： Zhi-di LEI Zheng-wu CHEN Xiao-quan YANG Jue DING Pei-fen WENG Shanghai Key Laboratory of Mechanics in Energy engineering Shanghai Institute of Applied Mathem atics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Key Laboratory of Aerodynamic Noise Control China Aerodynamics Research and Development CenterMianyang 621000China

The relationship between the number of detonation waves and the evolution process of the flow field in a rotating detonation engine was investigated through a numerical *** simulations were based on the Euler equation and a detailed chemical reaction *** the given engine model,the flow-field evolution became unstable when a single detonation wave was *** detonation waves formed spontaneously,changing the operational mode from single-wave to ***,when two or three detonation waves were released,the flow field evolved in a quasi-steady *** study revealed that the newly formed detonation wave resulted from an accelerated chemical reaction on the contact surface between the detonation products and the reactive *** satisfy the stable propagation requirements of detonation waves,we proposed a parameter called NL,which can be compared with the number of detonation waves in the combustor to predict the evolution(quasi-stable or unstable)of the flow ***,we verified the effectiveness of NL in a redesigned *** study may assist the operational mode control in rotating detonation engine experiments.

关键词： rotating detonation engine Chemical reaction Multiple detonation waves Stability

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Performance of rotating detonation engine with stratified injection

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2020年第9期21卷 734-744页

作者： Zhi-di LEI Xiao-quan YANG Jue DING Pei-fen WENG Xun-nian WANG Shanghai Key Laboratory of Mechanics in Energy engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China

In this study,a numerical study based on Euler equations and coupled with detail chemistry model is used to improve the propulsion performance and stability of the rotating detonation *** proposed fuel injection called stratified injection functions by suppressing the isobaric combustion process occurring on the contact surface between fuel and detonation products,and thus the proportion of fuel consumed by detonation wave increases from 67%to 95%,leading to more self-pressure gain and lower entropy generation.A pre-mixed hydrogen-oxygen-nitrogen mixture is used as a reactive *** computational results show that the propulsion performance and the operation stability of the engine with stratified injection are both improved,the temperature of the flow field is notably decreased,the specific impulse of the engine is improved by 16.3%,and the average temperature of the engine with stratified injection is reduced by 19.1%.

关键词： rotating detonation engine Injection pattern Propulsion performance Instability

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